Deck 8: Java Thread Class, Exception Handling, and Garbage Collection

Question 1

Under what circumstances might you use the yield method of the Thread class

A)To call from the currently running thread to allow another thread of the same or higher priority to run
B)To call on a waiting thread to allow it to run
C)To allow a thread of higher priority to run
D)To call from the currently running thread with a parameter designating which thread should be allowed to run

Answer 1

To call from the currently running thread to allow another thread of the same or higher priority to run

Question 2

Which of the following is the correct syntax for suggesting that the JVM performs garbage collection?

A)System.free();
B)System.setGarbageCollection();
C)System.out.gc();
D)System.gc();

Answer 2

System.gc();

Question 3

A class that cannot be a subclass is called as______ class.

A)abstract
B)parent class
C)Final
D)none of these

Answer 3

Final

Question 4

When method defined in subclass which has same signature as a method in a super class, it is known as method

A)Overloading
B)Overriding
C)Packing
D)None of these

Question 5

Which of the following statement is correct?

A)For positive numbers, result of operators >> and >>> are same
B)Java provides two operators to do left shift <<< and <<
C)>> is the zero fill right shift operator
D)>>> is the signed right shift operator

Question 6

Java language has support for which of the following types of comment ?

A)block, line and javadoc
B)javadoc, literal and string
C)javadoc, char and string
D)single, multiple and quote

Question 7

Consider the following program:
Import myLibrary.*;
Public class ShowSomeClass
{
// code for the class...
}
What is the name of the java file containing this program?

A)myLibrary.java
B)ShowSomeClass.java
C)ShowSomeClass
D)ShowSomeClass.class 1.

Question 8

Which of the following is TRUE?

A)In java, an instance field declared public generates a compilation error.
B)int is the name of a class available in the package java.lang
C)Instance variable names may only contain letters and digits.
D)A class has always a constructor (possibly automatically supplied by the java compiler).

Question 9

Consider the following code snippet
String river = new String("Columbia");
System.out.println(river.length());
What is printed?

A)6
B)7
C)8
D)Columbia

Question 10

What is different between a Java applet and a Java application?

A)An application can in general be trusted whereas an applet can't.
B)An applet must be executed in a browser environment.
C)An applet is not able to access the files of the computer it runs on
D)(A), (B) and (C).

Question 11

You read the following statement in a Java program that compiles and executes.
Submarine.dive(depth);
What can you say for sure?

A)depth must be an int
B)dive must be a method.
C)dive must be the name of an instance fie

Question 12

Consider
Public class MyClass
{
Public MyClass(){/*code*/
}
// more code...
}
To instantiate MyClass, you would write?

A)MyClass mc = new MyClass();
B)MyClass mc = MyClass();
C)MyClass mc = MyClass;
D)MyClass mc = new MyClass;

Question 13

In Java Inheritance

A)all fields of a class are private
B)all fields of a class are protected
C)a new class is derived from an existing class
D)none of these above

Question 14

When does Exceptions in Java arises in code sequence?

A)Run Time
B)Compilation Time
C)Can Occur Any Time
D)None of the mentioned

Question 15

Which of these keywords is not a part of exception handling?

A)try
B)finally
C)thrown
D)catch

Question 16

Which of these keywords is used to manually throw an exception?

A)try
B)finally
C)throw
D)catch